Learn the difference between lines with the same slope and those with an opposite reciprocal slope. This quick guide breaks ...

If lines are perpendicular to each other then \({m_1} \times {m_2} = - 1\) conversely if \({m_1} \times {m_2} = - 1\) then the lines are perpendicular to each other.

Finding the length of a line segment using Pythagoras' theorem. VideoFinding the length of a line segment using Pythagoras' theorem ...